<template>
  <header class="header">
    <h1>todos</h1>
    <input v-model="isShow" id="toggle-all" class="toggle-all" type="checkbox" >
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      v-model.trim="taskName"
      @keydown.enter="addTask"
    />
  </header>
</template>

<script>
export default {
    props: ['list'],
    data() {
        return {
            taskName: ''
        }
    },
    methods: {
        addTask() {
            if(this.taskName.length == 0) return alert('内容不能为空')
            this.$emit('addTask', this.taskName)
            this.taskName = ''
        }
    },
    computed: {
        isShow: {
            set(val) {
                this.list.forEach(item => item.isDone = val)
            },
            get() {
                if(this.list.length == 0) return false
                return this.list.every(item => item.isDone)
            }
        }
    }
}
</script>